Abstract
We have determined the position of deuterium atoms in δ-AlOOD by neutron powder diffraction at ambient pressure. As previously reported by theoretical and experimental studies, the deuterium atoms are located in the tunnel formed by the chains of AlO6 octahedra. The data are best fit with the P21 nm structure, producing bond lengths of D–O1 of 1.552(2) Å, O2–D of 1.020(2) Å and O1–O2 of 2.571(2). This study confirms that the hydrogen bond is asymmetric at ambient conditions in agreement with recent single-crystal synchrotron study for δ-AlOOH.
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Acknowledgments
We are grateful to Dr W.G. Marshall and Dr M.G. Tucker for their technical support and helpful suggestions during the neutron diffraction experiments at ISIS. We also thank to Dr J. Tsuchiya for providing detailed information on their theoretical study and Dr H. Kagi for useful comments. Crystal structure images are drawn using VESTA developed by K. Momma and F. Izumi (2006). We appreciate two anonymous reviewers for their constructive reviews that improved the manuscript. This work is partially supported by the Grant-in-Aid for Scientific Research to E. O. (no. 16075202 and 18104009) from Ministry of Education, Culture, Sports, Science and Technology of the Japanese Government and conducted as part of the 21st Century Center-of-Excellence program “Advanced Science and Technology Center for the Dynamic Earth”. A.S. and K.K. were supported by the Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.
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Vanpeteghem, C.B., Sano, A., Komatsu, K. et al. Neutron diffraction study of aluminous hydroxide δ-AlOOD. Phys Chem Minerals 34, 657–661 (2007). https://doi.org/10.1007/s00269-007-0180-8
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DOI: https://doi.org/10.1007/s00269-007-0180-8